pentagon correspondent barbara starr joins us now. could this be considered an act of war? >> the pentagon spokesman george little was asked that yesterday and he deferred. he said he wouldn't go there. look, make no mistake, carol, this raises tensions in the persian gulf, doesn't it? bullets flying through the air. this is not what anyone wants to see in this vital oil shipping lane area. the iranians this morning saying they will respond to any further transgressions. the u.s. insisting it was in international air space, routine surveillance mission. i think the question is, what happens if this does happen again? you know, nobody really knows. will the iranians take more aggressive action? will the u.s. military respond? it's very concerning because of the economic essentialness, the economic vitality of that very area, carol. >> barbara starr reporting live for us from the pentagon. also today, we could learn new details about the attack in benghazi that left four americans dead, including the u.s. ambassador to libya, chris stevens. this pentagon briefing comes as law